Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb73bc2019331774…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 19:09:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e193c708f48916fee6a66870e2a625d7 SHA-1: 76906392c340f88cda2a17f5c41956e215057aff SHA-256: bb73bc20193317748e463d9aeade4645720a1e487d6d3e2ac6fb0ede79410e91
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, masquerading as game hacks and generators to entice users. The primary malicious link identified is http://netcdn.tw/app/431946152/how-to-hack-someones-roblox-account-game-hack, which is flagged as a known malicious redirector. The document body and heuristics confirm a lure-based attack pattern, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/431946152/how-to-hack-someones-roblox-account-game-hack In PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-com_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-pro-hack_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/coin-master-hack-trick-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-shields-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/freespins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-hack-to-get-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/minecraft-pvp-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-hack-miners-haven-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/pokemon-go-free-bot_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/how-to-get-free-robux-on-alcatela5_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/get-free-roblox-card-codes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.idia.ac.id/repository/robux-apk_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3059 22488 bytes
SHA-256: acb7ed529cb39540a725a878f852142257df9d330c12de653fc5b38d7ced3048
font_01_sfnt_off0000624f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624F 19324 bytes
SHA-256: 64c0d96001d8dfb5bf7499830987bf6c9de47f878144bc2b65d78747ca645951

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